Fuel-pump.



N. MGUARTY.

FUEL PUMP.

APPLIGATION FILED FEB. 4, 1909.

Patented Aug. 3, 1909.

v 2 6 Y a w wg W WW dlianapolisfin the county of Marion and State li/seful Improvements in Fuel Pumps, of x through'a suitable packing gland 12 and 1S connected at its outer end to any suitable construction being such that the measuring ,member willnever be'subjected to high presspeed controlled governor" may be used to accomplish the adjustment of the measuring meinber.

UNITED STATES PATENT OFFICE.

NORMAN MCCARTY, OF INDIANAPOLIS, INDIANA, ASSIGNOR 'EO ATLAS ENGINE WORKS, OF

INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.-

FUEL-FUN Specification of Letters Patent.

Patented Aug. 3, 1909.

Application filed February 4, 1909. Serial No. 476,046.

To all whom-it may concern:

Be it known that I, NORMAN MCCARTY, a citizen of the United States, residing at Inof Indiana, ave invented certain new and hich the'l'ollowing is a specification.

The object of my invention is to produce a gpverning pump having a member by means A which the discharging effect of a fixed stroke displacing plunger may be readily varied from maximum to minimum, the

sures, necessary for the discharging action, therefore such that a .very sensitive The accompanying drawings illustrate my invention.

Figural is an elevation in partial vertical section of a ump embodying my invention, the section eing. taken upon two slightly separated parallel planes one through the axis of the measuring member and the other through the axis. of one of the valves, and

. 2 a section on line 22 of Fig.1.

n the drawings, indicates the main body of the pump structure inwhich is formed a cylindrical measuring chamber 11- within which is slidably mounted a measur ing plunger 12 which is extended outwardly means for itsreciprocation.v In the drawings such means is shown as an arm 13 carried by an eccentric strap 14 mounted upon an eccentric 15 carried by a rock shaft 16 which,in"turn, is connected to a speed control governor shown diagrammatically at 17. iornued in-body 10 are two passages 21 and which are off-set upon opposite sides of the measuring chamber 11 by an amount less than the radius of chamber 11 so that two-chambers 21 and 22 intersect and commiinicate with' the measuring chamber '11- at the'finner. end thereof. The two passages 21.and- 22might be'formed in any other desirabie'manner to produce a communication between said two passages and the measuring chamber 11 but the particular arrangement shown has been adopted in. order to reduce necessary clearance to the least possible amount and to gain a compact arrangement so that the parts may be readil operated. Passage 21 communicates with an ejection chamber 23 through an intervening valve seat 24, and passage 22 communicates with an admission chamber 25'through an intervening valve seat 26'. Mounted in passage 21 is a valve stem 27 which carries at its inner end a valve 28 adapted to seat in valve seat 24, and mounted in passage 22 is a valve stem. 29 carrying a valve 30 at its inner end which valve isadapted to seat in seat 26. At'its outer end, stern 27 is rovided with a fixed head 31 and with a yieldingly movable head 32 between which heads extends one arm 33 of an operating lever 34.

Similarly stem 29 is provided with a fixed head 35 and a yieldingly movable head 36 between which lies an arm 37 of lever 34. Leading into chamber 25 is an oil inlet 42. Leading fromchamber23 is a discharge passage 43 which communicates with a discharge pipe 44 through, a suitable outwardly opening check valve 45, the pipe 44 being led to any desired point. The structure is especially adapted for use in connection with theatomizer of an internal combustion engine wherein the fuel is injected into the combustion chamber against the compression therein by means of a higher air pressure so that there is, in this use of the apparatus', a maintained pressure in pipe 44 of a considerable amount, as high as 1,000 lbs. to the square inch;

Communicating with chamber 23 is a pump chamber 46 in which is mounted a pump iston 47 which may be given reciprocation y any suitable means, preferably one Which-produces afixed stroke, and in the drawings shown as an arm 48 carried by an eccentric strap 49 mounted upon an eccentric 50 carried by a shaft 51 rotated in any suitable manner in synchronism with the engine to be served. Eccentric '49 may conveniently carry an ear 52 which is connected to lever 34 by means of a link 53. v

The operation is as follows :The arms 33 and 37 of lever 34 are so connected with the valves 28 and 30 that they will be opened and closed in alternation, each valve reach,-

. ing its seat before the other is unseated, the

yielding collars 32 and36 permitting this ace tion; The inner end' of the measuring plunger 12 is so formed that it may be brought into closeconjunctio with the stems 27 and 29 so that therevvil be practically no clearance. Chamber 25 is kept continuously filled with oil from asuitable source of supply and a rotation of shaft 51, in the. direction indicated by the arrow, will first continue the downward or outward movement of piston .47 so that any oil within chamber 11 will be drawn down into chamber 23 and cylinder 46. Thereupon valve 28 will be brought to its seat and an inward movement of piston 47 will eject oil through passage 43 past valve 45 into pipe 44. During this time, and while valve 28 is seated, valve 30 will be moved away from its seat so that oil may flow from chamber 25 into the measuring chamber 11 and the volume of this chamber 11 .will be determined by the action of the speed control governor 17, the measuring plunger 12 being moved in or out so as to decrease or increase the receiving volume of chamber 11 according .to the immediate needs of theengine. 'At this time, it will be noticed, the

measuring plunger 12 isnot subjected to any of the pressure which is being exerted upon the fuel being discharged past valve 45. Before plunger 47 is started upon its next outward stroke, valve 30 is seated and then valve 28 is unseated so that the outward stroke of piston 47 will draw the fuel which is Within the measuring chamber 11 down into chamber 23 and cylinder 46, from which point the operation is repeated as already described. l

1 claim as my invention:

I. A pump comprising a measuring chamber, an admission chamber communicating therewith, a valve arranged between the measuring chambe r and admission chamber, an ejection chamber communicating with the measuring chamber, a valve arranged between the measuring chamber and ejecting chamber, ejecting 'means associated with ating said ejecting means,

and means for opersaid ejecting chamber,

and foralternately operating the valves.

2. A pump comprising a measuring chamber, an admission chamber communicating therewith, a valve arranged between the measuring chamber and admission chamber, an ejection chamber communicating with the measuring chamber, a valve arranged between the measuring chamber and ejecting chamber, ejecting means associated with said ejecting chamber, means for operating said ejecting means ating the valves and means for varying the receptivity of the measuring chamber.

3'. A pump comprising a measuring chamber, an admission chamber communicating therewith, a valve arranged between said admission chamber and measuring chamber, an ejecting chamber'communicating with the measuring chamber, a valve arranged between said measuring chambei and-e ecting chamber, a plunger mounted within the 'tion,

chamber for discharging variably measured and for alternately opermeasuring chamber and movable therein to vary the capacity thereof, ger mounted in the ejecting chamber, and means for operating said plungers and valves.

4. A pump comprising a measuring chamber, an admission chamber, an ejection chamber, means for introducing fluid into the measuring chamber from the admission chamber independent of the ejection chem-1 her and for'introducing fluid from themeasuring chamber into the ejection chamber independent of the admission chamber, and means for ejecting fluid from the ejection chamber independent of the admission chamber.

5. A pump comprising a measuring chamber, means for varying the receptivity of said measuring chamber, an admission chamber, an ejection chamber, means for introducing fluid into the measuring chamber from the admission chamber independent of the ejection chamber and for introducing fluid from the measuring chamber into the ejection chamber independent of the admission chamber, and means for ejecting fluid from the ejectionchamber independent of the admission chamber.

6. The combination with a pump having a displacing member, an inlet .assage, an outlet passage, and an outwarc ly yielding. check-valve in said outlet passage, a measuring 'means for delivering to said pumpv through said inlet chamber successive measured variable quantities of material.

7. The combination with a pump having an ejecting member, an inlet passage, an outlet passage, and an outwardly yielding check valve in said outlet passage, of a measuring chamber communicating with said inlet pa s' sage of the pump, said. measuring chamber and the pump a valve arranged between an ejecting plunchamber, means for varying the receptivity of said measuring chamber, and means for q operatmg the valve between said measuring chamber and the pump chamber.

8. In a pump comprising a measuring chamber, a discharge chamber, and an inter mediate connection between said two chambers,'means for disestablishing saidoonnecmeans cotiperating with the measuring quantities from the measuring chamber into the discharging chamber, and means for posi 'tively e ecting material from the ejecting chamber.

In witness whereof, I, have hereunto set my hand and seal atIndianapolis, Indiana,

this twenty ninth day of January, A. D. one 

